diff --git a/src/shared/components/RequestLoggerDetail.sections.tsx b/src/shared/components/RequestLoggerDetail.sections.tsx
index 78527ab495..cbdce62a01 100644
--- a/src/shared/components/RequestLoggerDetail.sections.tsx
+++ b/src/shared/components/RequestLoggerDetail.sections.tsx
@@ -273,6 +273,21 @@ export function ConversationContextSection({ log, detail }) {
               continues from parent
             </a>
           )}
+          {liveDetail?.sessionTag && (
+            // /dashboard/conversations reads its own `?tree=<id>` deep-link param
+            // from a fresh mount too (useState(() => searchParams.get("tree")) in
+            // that page) -- same full-navigation reasoning as the parent-log link
+            // above. sessionTag is the same conv_<id> the conversations list and
+            // /api/conversations/[id]/tree both key on.
+            <a
+              href={`/dashboard/conversations?tree=${encodeURIComponent(liveDetail.sessionTag)}`}
+              className="flex items-center gap-1 text-[11px] text-text-muted hover:text-primary transition-colors"
+              title={`Open conversation ${liveDetail.sessionTag}`}
+            >
+              <span className="material-symbols-outlined text-[14px]">forum</span>
+              view conversation
+            </a>
+          )}
         </div>
         {open && (
           <div className="flex items-center gap-1">
diff --git a/tests/unit/ui/log-detail-conversation-link-12646.test.tsx b/tests/unit/ui/log-detail-conversation-link-12646.test.tsx
new file mode 100644
index 0000000000..9a8ad2eeba
--- /dev/null
+++ b/tests/unit/ui/log-detail-conversation-link-12646.test.tsx
@@ -0,0 +1,106 @@
+// @vitest-environment jsdom
+/**
+ * Guard for #12646: a log entry's Conversation Context header links to the
+ * conversation that owns it.
+ *
+ * The link is a plain `<a href>` on purpose, not a client-side route push:
+ * /dashboard/conversations reads its own `?tree=<id>` deep-link param from a
+ * fresh mount (`useState(() => searchParams.get("tree"))`), so it only picks
+ * the param up on a full navigation. A future refactor to a Next `<Link>`
+ * would silently stop opening the right tree — which is what this test pins.
+ */
+import React from "react";
+import { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+const RequestLoggerDetail = (await import("../../../src/shared/components/RequestLoggerDetail.tsx"))
+  .default;
+
+let container: HTMLElement;
+let root: Root;
+
+function baseLog(overrides: Record<string, unknown> = {}) {
+  return {
+    id: "log-12646",
+    status: 200,
+    method: "POST",
+    path: "/v1/chat/completions",
+    model: "gpt-test",
+    provider: "openai",
+    timestamp: new Date().toISOString(),
+    duration: 42,
+    tokens: { in: 1, out: 2 },
+    ...overrides,
+  };
+}
+
+const noop = () => {};
+
+// The section short-circuits with `if (allTurns.length === 0) return null`, so the
+// fixture needs a request body that normalizes into at least one turn — otherwise
+// the whole header, link included, never mounts and the assertions would pass or
+// fail for the wrong reason.
+const REQUEST_BODY_WITH_A_TURN = {
+  model: "gpt-test",
+  messages: [{ role: "user", content: "hello" }],
+};
+
+async function renderDetail(detail: Record<string, unknown>) {
+  const log = baseLog();
+  await act(async () => {
+    root.render(
+      <RequestLoggerDetail
+        log={log}
+        detail={{ ...log, requestBody: REQUEST_BODY_WITH_A_TURN, ...detail }}
+        loading={false}
+        debugEnabled={false}
+        onClose={noop}
+        onCopy={async () => true}
+      />
+    );
+  });
+}
+
+function conversationLink(): HTMLAnchorElement | null {
+  return container.querySelector<HTMLAnchorElement>('a[href^="/dashboard/conversations?tree="]');
+}
+
+beforeEach(() => {
+  container = document.createElement("div");
+  document.body.appendChild(container);
+  root = createRoot(container);
+});
+
+afterEach(async () => {
+  if (root) {
+    await act(async () => {
+      root.unmount();
+    });
+  }
+  container?.remove();
+});
+
+describe("log detail — Conversation Context link (#12646)", () => {
+  it("deep-links to the owning conversation when the detail carries a sessionTag", async () => {
+    await renderDetail({ sessionTag: "conv_abc123" });
+
+    const link = conversationLink();
+    expect(link).not.toBeNull();
+    expect(link!.getAttribute("href")).toBe("/dashboard/conversations?tree=conv_abc123");
+  });
+
+  it("percent-encodes a sessionTag that is not URL-safe", async () => {
+    await renderDetail({ sessionTag: "conv_a b/c?d" });
+
+    expect(conversationLink()!.getAttribute("href")).toBe(
+      `/dashboard/conversations?tree=${encodeURIComponent("conv_a b/c?d")}`
+    );
+  });
+
+  it("renders no conversation link when the detail has no sessionTag", async () => {
+    await renderDetail({});
+
+    expect(conversationLink()).toBeNull();
+  });
+});